<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="button" value="按钮" onclick="f1()">
<script>
  /*1.无参无返回值*/
  function f1(){
    console.log("f1");
  }
  /*调用方法*/
  f1();
  /*2.有参无返回值*/
  function f2(name,age){
    console.log(name+":"+age);
  }
  f2("孙尚香",50)
  /*3.无参有返回值*/
  function f3(){
    return "我是返回值";
  }
  let info =f3();
  console.log(info)
  /*4.有参有返回值*/
  function f4(x,y){
    return x*y;
  }
  let result = f4(8,9);
  console.log(result);
  /*5.第二种声明方法的方式*/
  let f5 = function (name,age){
    console.log(name+":"+age);
  }
  f5("刘备",20)
  /*第三种声明方法的方法*/
  let f6 = new Function("name","age","console.log(name+':'+age)");
  f6("吕布",66)
</script>
</body>
</html>